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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 09:49:36 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 09:49:36 +0000
commit5ec6074f0633939fd17d94111d10c6c6b062978c (patch)
treebfaa17b5a64abc66c918e9c70969e519d9e1df8e /help.c
parentInitial commit. (diff)
downloadgit-5ec6074f0633939fd17d94111d10c6c6b062978c.tar.xz
git-5ec6074f0633939fd17d94111d10c6c6b062978c.zip
Adding upstream version 1:2.30.2.upstream/1%2.30.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'help.c')
-rw-r--r--help.c743
1 files changed, 743 insertions, 0 deletions
diff --git a/help.c b/help.c
new file mode 100644
index 0000000..3c3bdec
--- /dev/null
+++ b/help.c
@@ -0,0 +1,743 @@
+#include "cache.h"
+#include "config.h"
+#include "builtin.h"
+#include "exec-cmd.h"
+#include "run-command.h"
+#include "levenshtein.h"
+#include "help.h"
+#include "command-list.h"
+#include "string-list.h"
+#include "column.h"
+#include "version.h"
+#include "refs.h"
+#include "parse-options.h"
+
+struct category_description {
+ uint32_t category;
+ const char *desc;
+};
+static uint32_t common_mask =
+ CAT_init | CAT_worktree | CAT_info |
+ CAT_history | CAT_remote;
+static struct category_description common_categories[] = {
+ { CAT_init, N_("start a working area (see also: git help tutorial)") },
+ { CAT_worktree, N_("work on the current change (see also: git help everyday)") },
+ { CAT_info, N_("examine the history and state (see also: git help revisions)") },
+ { CAT_history, N_("grow, mark and tweak your common history") },
+ { CAT_remote, N_("collaborate (see also: git help workflows)") },
+ { 0, NULL }
+};
+static struct category_description main_categories[] = {
+ { CAT_mainporcelain, N_("Main Porcelain Commands") },
+ { CAT_ancillarymanipulators, N_("Ancillary Commands / Manipulators") },
+ { CAT_ancillaryinterrogators, N_("Ancillary Commands / Interrogators") },
+ { CAT_foreignscminterface, N_("Interacting with Others") },
+ { CAT_plumbingmanipulators, N_("Low-level Commands / Manipulators") },
+ { CAT_plumbinginterrogators, N_("Low-level Commands / Interrogators") },
+ { CAT_synchingrepositories, N_("Low-level Commands / Syncing Repositories") },
+ { CAT_purehelpers, N_("Low-level Commands / Internal Helpers") },
+ { 0, NULL }
+};
+
+static const char *drop_prefix(const char *name, uint32_t category)
+{
+ const char *new_name;
+
+ if (skip_prefix(name, "git-", &new_name))
+ return new_name;
+ if (category == CAT_guide && skip_prefix(name, "git", &new_name))
+ return new_name;
+ return name;
+
+}
+
+static void extract_cmds(struct cmdname_help **p_cmds, uint32_t mask)
+{
+ int i, nr = 0;
+ struct cmdname_help *cmds;
+
+ if (ARRAY_SIZE(command_list) == 0)
+ BUG("empty command_list[] is a sign of broken generate-cmdlist.sh");
+
+ ALLOC_ARRAY(cmds, ARRAY_SIZE(command_list) + 1);
+
+ for (i = 0; i < ARRAY_SIZE(command_list); i++) {
+ const struct cmdname_help *cmd = command_list + i;
+
+ if (!(cmd->category & mask))
+ continue;
+
+ cmds[nr] = *cmd;
+ cmds[nr].name = drop_prefix(cmd->name, cmd->category);
+
+ nr++;
+ }
+ cmds[nr].name = NULL;
+ *p_cmds = cmds;
+}
+
+static void print_command_list(const struct cmdname_help *cmds,
+ uint32_t mask, int longest)
+{
+ int i;
+
+ for (i = 0; cmds[i].name; i++) {
+ if (cmds[i].category & mask) {
+ size_t len = strlen(cmds[i].name);
+ printf(" %s ", cmds[i].name);
+ if (longest > len)
+ mput_char(' ', longest - len);
+ puts(_(cmds[i].help));
+ }
+ }
+}
+
+static int cmd_name_cmp(const void *elem1, const void *elem2)
+{
+ const struct cmdname_help *e1 = elem1;
+ const struct cmdname_help *e2 = elem2;
+
+ return strcmp(e1->name, e2->name);
+}
+
+static void print_cmd_by_category(const struct category_description *catdesc,
+ int *longest_p)
+{
+ struct cmdname_help *cmds;
+ int longest = 0;
+ int i, nr = 0;
+ uint32_t mask = 0;
+
+ for (i = 0; catdesc[i].desc; i++)
+ mask |= catdesc[i].category;
+
+ extract_cmds(&cmds, mask);
+
+ for (i = 0; cmds[i].name; i++, nr++) {
+ if (longest < strlen(cmds[i].name))
+ longest = strlen(cmds[i].name);
+ }
+ QSORT(cmds, nr, cmd_name_cmp);
+
+ for (i = 0; catdesc[i].desc; i++) {
+ uint32_t mask = catdesc[i].category;
+ const char *desc = catdesc[i].desc;
+
+ printf("\n%s\n", _(desc));
+ print_command_list(cmds, mask, longest);
+ }
+ free(cmds);
+ if (longest_p)
+ *longest_p = longest;
+}
+
+void add_cmdname(struct cmdnames *cmds, const char *name, int len)
+{
+ struct cmdname *ent;
+ FLEX_ALLOC_MEM(ent, name, name, len);
+ ent->len = len;
+
+ ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
+ cmds->names[cmds->cnt++] = ent;
+}
+
+static void clean_cmdnames(struct cmdnames *cmds)
+{
+ int i;
+ for (i = 0; i < cmds->cnt; ++i)
+ free(cmds->names[i]);
+ free(cmds->names);
+ cmds->cnt = 0;
+ cmds->alloc = 0;
+}
+
+static int cmdname_compare(const void *a_, const void *b_)
+{
+ struct cmdname *a = *(struct cmdname **)a_;
+ struct cmdname *b = *(struct cmdname **)b_;
+ return strcmp(a->name, b->name);
+}
+
+static void uniq(struct cmdnames *cmds)
+{
+ int i, j;
+
+ if (!cmds->cnt)
+ return;
+
+ for (i = j = 1; i < cmds->cnt; i++) {
+ if (!strcmp(cmds->names[i]->name, cmds->names[j-1]->name))
+ free(cmds->names[i]);
+ else
+ cmds->names[j++] = cmds->names[i];
+ }
+
+ cmds->cnt = j;
+}
+
+void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
+{
+ int ci, cj, ei;
+ int cmp;
+
+ ci = cj = ei = 0;
+ while (ci < cmds->cnt && ei < excludes->cnt) {
+ cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
+ if (cmp < 0)
+ cmds->names[cj++] = cmds->names[ci++];
+ else if (cmp == 0) {
+ ei++;
+ free(cmds->names[ci++]);
+ } else if (cmp > 0)
+ ei++;
+ }
+
+ while (ci < cmds->cnt)
+ cmds->names[cj++] = cmds->names[ci++];
+
+ cmds->cnt = cj;
+}
+
+static void pretty_print_cmdnames(struct cmdnames *cmds, unsigned int colopts)
+{
+ struct string_list list = STRING_LIST_INIT_NODUP;
+ struct column_options copts;
+ int i;
+
+ for (i = 0; i < cmds->cnt; i++)
+ string_list_append(&list, cmds->names[i]->name);
+ /*
+ * always enable column display, we only consult column.*
+ * about layout strategy and stuff
+ */
+ colopts = (colopts & ~COL_ENABLE_MASK) | COL_ENABLED;
+ memset(&copts, 0, sizeof(copts));
+ copts.indent = " ";
+ copts.padding = 2;
+ print_columns(&list, colopts, &copts);
+ string_list_clear(&list, 0);
+}
+
+static void list_commands_in_dir(struct cmdnames *cmds,
+ const char *path,
+ const char *prefix)
+{
+ DIR *dir = opendir(path);
+ struct dirent *de;
+ struct strbuf buf = STRBUF_INIT;
+ int len;
+
+ if (!dir)
+ return;
+ if (!prefix)
+ prefix = "git-";
+
+ strbuf_addf(&buf, "%s/", path);
+ len = buf.len;
+
+ while ((de = readdir(dir)) != NULL) {
+ const char *ent;
+ size_t entlen;
+
+ if (!skip_prefix(de->d_name, prefix, &ent))
+ continue;
+
+ strbuf_setlen(&buf, len);
+ strbuf_addstr(&buf, de->d_name);
+ if (!is_executable(buf.buf))
+ continue;
+
+ entlen = strlen(ent);
+ strip_suffix(ent, ".exe", &entlen);
+
+ add_cmdname(cmds, ent, entlen);
+ }
+ closedir(dir);
+ strbuf_release(&buf);
+}
+
+void load_command_list(const char *prefix,
+ struct cmdnames *main_cmds,
+ struct cmdnames *other_cmds)
+{
+ const char *env_path = getenv("PATH");
+ const char *exec_path = git_exec_path();
+
+ load_builtin_commands(prefix, main_cmds);
+
+ if (exec_path) {
+ list_commands_in_dir(main_cmds, exec_path, prefix);
+ QSORT(main_cmds->names, main_cmds->cnt, cmdname_compare);
+ uniq(main_cmds);
+ }
+
+ if (env_path) {
+ char *paths, *path, *colon;
+ path = paths = xstrdup(env_path);
+ while (1) {
+ if ((colon = strchr(path, PATH_SEP)))
+ *colon = 0;
+ if (!exec_path || strcmp(path, exec_path))
+ list_commands_in_dir(other_cmds, path, prefix);
+
+ if (!colon)
+ break;
+ path = colon + 1;
+ }
+ free(paths);
+
+ QSORT(other_cmds->names, other_cmds->cnt, cmdname_compare);
+ uniq(other_cmds);
+ }
+ exclude_cmds(other_cmds, main_cmds);
+}
+
+void list_commands(unsigned int colopts,
+ struct cmdnames *main_cmds, struct cmdnames *other_cmds)
+{
+ if (main_cmds->cnt) {
+ const char *exec_path = git_exec_path();
+ printf_ln(_("available git commands in '%s'"), exec_path);
+ putchar('\n');
+ pretty_print_cmdnames(main_cmds, colopts);
+ putchar('\n');
+ }
+
+ if (other_cmds->cnt) {
+ printf_ln(_("git commands available from elsewhere on your $PATH"));
+ putchar('\n');
+ pretty_print_cmdnames(other_cmds, colopts);
+ putchar('\n');
+ }
+}
+
+void list_common_cmds_help(void)
+{
+ puts(_("These are common Git commands used in various situations:"));
+ print_cmd_by_category(common_categories, NULL);
+}
+
+void list_all_main_cmds(struct string_list *list)
+{
+ struct cmdnames main_cmds, other_cmds;
+ int i;
+
+ memset(&main_cmds, 0, sizeof(main_cmds));
+ memset(&other_cmds, 0, sizeof(other_cmds));
+ load_command_list("git-", &main_cmds, &other_cmds);
+
+ for (i = 0; i < main_cmds.cnt; i++)
+ string_list_append(list, main_cmds.names[i]->name);
+
+ clean_cmdnames(&main_cmds);
+ clean_cmdnames(&other_cmds);
+}
+
+void list_all_other_cmds(struct string_list *list)
+{
+ struct cmdnames main_cmds, other_cmds;
+ int i;
+
+ memset(&main_cmds, 0, sizeof(main_cmds));
+ memset(&other_cmds, 0, sizeof(other_cmds));
+ load_command_list("git-", &main_cmds, &other_cmds);
+
+ for (i = 0; i < other_cmds.cnt; i++)
+ string_list_append(list, other_cmds.names[i]->name);
+
+ clean_cmdnames(&main_cmds);
+ clean_cmdnames(&other_cmds);
+}
+
+void list_cmds_by_category(struct string_list *list,
+ const char *cat)
+{
+ int i, n = ARRAY_SIZE(command_list);
+ uint32_t cat_id = 0;
+
+ for (i = 0; category_names[i]; i++) {
+ if (!strcmp(cat, category_names[i])) {
+ cat_id = 1UL << i;
+ break;
+ }
+ }
+ if (!cat_id)
+ die(_("unsupported command listing type '%s'"), cat);
+
+ for (i = 0; i < n; i++) {
+ struct cmdname_help *cmd = command_list + i;
+
+ if (!(cmd->category & cat_id))
+ continue;
+ string_list_append(list, drop_prefix(cmd->name, cmd->category));
+ }
+}
+
+void list_cmds_by_config(struct string_list *list)
+{
+ const char *cmd_list;
+
+ if (git_config_get_string_tmp("completion.commands", &cmd_list))
+ return;
+
+ string_list_sort(list);
+ string_list_remove_duplicates(list, 0);
+
+ while (*cmd_list) {
+ struct strbuf sb = STRBUF_INIT;
+ const char *p = strchrnul(cmd_list, ' ');
+
+ strbuf_add(&sb, cmd_list, p - cmd_list);
+ if (sb.buf[0] == '-')
+ string_list_remove(list, sb.buf + 1, 0);
+ else
+ string_list_insert(list, sb.buf);
+ strbuf_release(&sb);
+ while (*p == ' ')
+ p++;
+ cmd_list = p;
+ }
+}
+
+void list_guides_help(void)
+{
+ struct category_description catdesc[] = {
+ { CAT_guide, N_("The Git concept guides are:") },
+ { 0, NULL }
+ };
+ print_cmd_by_category(catdesc, NULL);
+ putchar('\n');
+}
+
+static int get_alias(const char *var, const char *value, void *data)
+{
+ struct string_list *list = data;
+
+ if (skip_prefix(var, "alias.", &var))
+ string_list_append(list, var)->util = xstrdup(value);
+
+ return 0;
+}
+
+void list_all_cmds_help(void)
+{
+ struct string_list others = STRING_LIST_INIT_DUP;
+ struct string_list alias_list = STRING_LIST_INIT_DUP;
+ struct cmdname_help *aliases;
+ int i, longest;
+
+ printf_ln(_("See 'git help <command>' to read about a specific subcommand"));
+ print_cmd_by_category(main_categories, &longest);
+
+ list_all_other_cmds(&others);
+ if (others.nr)
+ printf("\n%s\n", _("External commands"));
+ for (i = 0; i < others.nr; i++)
+ printf(" %s\n", others.items[i].string);
+ string_list_clear(&others, 0);
+
+ git_config(get_alias, &alias_list);
+ string_list_sort(&alias_list);
+
+ for (i = 0; i < alias_list.nr; i++) {
+ size_t len = strlen(alias_list.items[i].string);
+ if (longest < len)
+ longest = len;
+ }
+
+ if (alias_list.nr) {
+ printf("\n%s\n", _("Command aliases"));
+ ALLOC_ARRAY(aliases, alias_list.nr + 1);
+ for (i = 0; i < alias_list.nr; i++) {
+ aliases[i].name = alias_list.items[i].string;
+ aliases[i].help = alias_list.items[i].util;
+ aliases[i].category = 1;
+ }
+ aliases[alias_list.nr].name = NULL;
+ print_command_list(aliases, 1, longest);
+ free(aliases);
+ }
+ string_list_clear(&alias_list, 1);
+}
+
+int is_in_cmdlist(struct cmdnames *c, const char *s)
+{
+ int i;
+ for (i = 0; i < c->cnt; i++)
+ if (!strcmp(s, c->names[i]->name))
+ return 1;
+ return 0;
+}
+
+static int autocorrect;
+static struct cmdnames aliases;
+
+#define AUTOCORRECT_NEVER (-2)
+#define AUTOCORRECT_IMMEDIATELY (-1)
+
+static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
+{
+ const char *p;
+
+ if (!strcmp(var, "help.autocorrect")) {
+ if (!value)
+ return config_error_nonbool(var);
+ if (!strcmp(value, "never")) {
+ autocorrect = AUTOCORRECT_NEVER;
+ } else if (!strcmp(value, "immediate")) {
+ autocorrect = AUTOCORRECT_IMMEDIATELY;
+ } else {
+ int v = git_config_int(var, value);
+ autocorrect = (v < 0)
+ ? AUTOCORRECT_IMMEDIATELY : v;
+ }
+ }
+ /* Also use aliases for command lookup */
+ if (skip_prefix(var, "alias.", &p))
+ add_cmdname(&aliases, p, strlen(p));
+
+ return git_default_config(var, value, cb);
+}
+
+static int levenshtein_compare(const void *p1, const void *p2)
+{
+ const struct cmdname *const *c1 = p1, *const *c2 = p2;
+ const char *s1 = (*c1)->name, *s2 = (*c2)->name;
+ int l1 = (*c1)->len;
+ int l2 = (*c2)->len;
+ return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
+}
+
+static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
+{
+ int i;
+ ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
+
+ for (i = 0; i < old->cnt; i++)
+ cmds->names[cmds->cnt++] = old->names[i];
+ FREE_AND_NULL(old->names);
+ old->cnt = 0;
+}
+
+/* An empirically derived magic number */
+#define SIMILARITY_FLOOR 7
+#define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR)
+
+static const char bad_interpreter_advice[] =
+ N_("'%s' appears to be a git command, but we were not\n"
+ "able to execute it. Maybe git-%s is broken?");
+
+const char *help_unknown_cmd(const char *cmd)
+{
+ int i, n, best_similarity = 0;
+ struct cmdnames main_cmds, other_cmds;
+ struct cmdname_help *common_cmds;
+
+ memset(&main_cmds, 0, sizeof(main_cmds));
+ memset(&other_cmds, 0, sizeof(other_cmds));
+ memset(&aliases, 0, sizeof(aliases));
+
+ read_early_config(git_unknown_cmd_config, NULL);
+
+ if (autocorrect == AUTOCORRECT_NEVER) {
+ fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
+ exit(1);
+ }
+
+ load_command_list("git-", &main_cmds, &other_cmds);
+
+ add_cmd_list(&main_cmds, &aliases);
+ add_cmd_list(&main_cmds, &other_cmds);
+ QSORT(main_cmds.names, main_cmds.cnt, cmdname_compare);
+ uniq(&main_cmds);
+
+ extract_cmds(&common_cmds, common_mask);
+
+ /* This abuses cmdname->len for levenshtein distance */
+ for (i = 0, n = 0; i < main_cmds.cnt; i++) {
+ int cmp = 0; /* avoid compiler stupidity */
+ const char *candidate = main_cmds.names[i]->name;
+
+ /*
+ * An exact match means we have the command, but
+ * for some reason exec'ing it gave us ENOENT; probably
+ * it's a bad interpreter in the #! line.
+ */
+ if (!strcmp(candidate, cmd))
+ die(_(bad_interpreter_advice), cmd, cmd);
+
+ /* Does the candidate appear in common_cmds list? */
+ while (common_cmds[n].name &&
+ (cmp = strcmp(common_cmds[n].name, candidate)) < 0)
+ n++;
+ if (common_cmds[n].name && !cmp) {
+ /* Yes, this is one of the common commands */
+ n++; /* use the entry from common_cmds[] */
+ if (starts_with(candidate, cmd)) {
+ /* Give prefix match a very good score */
+ main_cmds.names[i]->len = 0;
+ continue;
+ }
+ }
+
+ main_cmds.names[i]->len =
+ levenshtein(cmd, candidate, 0, 2, 1, 3) + 1;
+ }
+ FREE_AND_NULL(common_cmds);
+
+ QSORT(main_cmds.names, main_cmds.cnt, levenshtein_compare);
+
+ if (!main_cmds.cnt)
+ die(_("Uh oh. Your system reports no Git commands at all."));
+
+ /* skip and count prefix matches */
+ for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++)
+ ; /* still counting */
+
+ if (main_cmds.cnt <= n) {
+ /* prefix matches with everything? that is too ambiguous */
+ best_similarity = SIMILARITY_FLOOR + 1;
+ } else {
+ /* count all the most similar ones */
+ for (best_similarity = main_cmds.names[n++]->len;
+ (n < main_cmds.cnt &&
+ best_similarity == main_cmds.names[n]->len);
+ n++)
+ ; /* still counting */
+ }
+ if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
+ const char *assumed = main_cmds.names[0]->name;
+ main_cmds.names[0] = NULL;
+ clean_cmdnames(&main_cmds);
+ fprintf_ln(stderr,
+ _("WARNING: You called a Git command named '%s', "
+ "which does not exist."),
+ cmd);
+ if (autocorrect == AUTOCORRECT_IMMEDIATELY)
+ fprintf_ln(stderr,
+ _("Continuing under the assumption that "
+ "you meant '%s'."),
+ assumed);
+ else {
+ fprintf_ln(stderr,
+ _("Continuing in %0.1f seconds, "
+ "assuming that you meant '%s'."),
+ (float)autocorrect/10.0, assumed);
+ sleep_millisec(autocorrect * 100);
+ }
+ return assumed;
+ }
+
+ fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
+
+ if (SIMILAR_ENOUGH(best_similarity)) {
+ fprintf_ln(stderr,
+ Q_("\nThe most similar command is",
+ "\nThe most similar commands are",
+ n));
+
+ for (i = 0; i < n; i++)
+ fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
+ }
+
+ exit(1);
+}
+
+void get_version_info(struct strbuf *buf, int show_build_options)
+{
+ /*
+ * The format of this string should be kept stable for compatibility
+ * with external projects that rely on the output of "git version".
+ *
+ * Always show the version, even if other options are given.
+ */
+ strbuf_addf(buf, "git version %s\n", git_version_string);
+
+ if (show_build_options) {
+ strbuf_addf(buf, "cpu: %s\n", GIT_HOST_CPU);
+ if (git_built_from_commit_string[0])
+ strbuf_addf(buf, "built from commit: %s\n",
+ git_built_from_commit_string);
+ else
+ strbuf_addstr(buf, "no commit associated with this build\n");
+ strbuf_addf(buf, "sizeof-long: %d\n", (int)sizeof(long));
+ strbuf_addf(buf, "sizeof-size_t: %d\n", (int)sizeof(size_t));
+ strbuf_addf(buf, "shell-path: %s\n", SHELL_PATH);
+ /* NEEDSWORK: also save and output GIT-BUILD_OPTIONS? */
+ }
+}
+
+int cmd_version(int argc, const char **argv, const char *prefix)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int build_options = 0;
+ const char * const usage[] = {
+ N_("git version [<options>]"),
+ NULL
+ };
+ struct option options[] = {
+ OPT_BOOL(0, "build-options", &build_options,
+ "also print build options"),
+ OPT_END()
+ };
+
+ argc = parse_options(argc, argv, prefix, options, usage, 0);
+
+ get_version_info(&buf, build_options);
+ printf("%s", buf.buf);
+
+ strbuf_release(&buf);
+
+ return 0;
+}
+
+struct similar_ref_cb {
+ const char *base_ref;
+ struct string_list *similar_refs;
+};
+
+static int append_similar_ref(const char *refname, const struct object_id *oid,
+ int flags, void *cb_data)
+{
+ struct similar_ref_cb *cb = (struct similar_ref_cb *)(cb_data);
+ char *branch = strrchr(refname, '/') + 1;
+
+ /* A remote branch of the same name is deemed similar */
+ if (starts_with(refname, "refs/remotes/") &&
+ !strcmp(branch, cb->base_ref))
+ string_list_append_nodup(cb->similar_refs,
+ shorten_unambiguous_ref(refname, 1));
+ return 0;
+}
+
+static struct string_list guess_refs(const char *ref)
+{
+ struct similar_ref_cb ref_cb;
+ struct string_list similar_refs = STRING_LIST_INIT_DUP;
+
+ ref_cb.base_ref = ref;
+ ref_cb.similar_refs = &similar_refs;
+ for_each_ref(append_similar_ref, &ref_cb);
+ return similar_refs;
+}
+
+NORETURN void help_unknown_ref(const char *ref, const char *cmd,
+ const char *error)
+{
+ int i;
+ struct string_list suggested_refs = guess_refs(ref);
+
+ fprintf_ln(stderr, _("%s: %s - %s"), cmd, ref, error);
+
+ if (suggested_refs.nr > 0) {
+ fprintf_ln(stderr,
+ Q_("\nDid you mean this?",
+ "\nDid you mean one of these?",
+ suggested_refs.nr));
+ for (i = 0; i < suggested_refs.nr; i++)
+ fprintf(stderr, "\t%s\n", suggested_refs.items[i].string);
+ }
+
+ string_list_clear(&suggested_refs, 0);
+ exit(1);
+}